I think you may be confused. Su is not exclusively feminine. It is a possessive adjective used for masculine and feminine nouns. Su amigo Su amiga. It can be translated as your (formal), his, her, its.

If the third person singular is used in any contest without stating that it is a boy or a girl, it is mostly "it"
For example; es bueno can be he/she/it is good but since no gender was indicated "it" is mostly chosen
Hope this help -)

It's and its do not mean the same thing. It's ONLY is a contraction for 'it is.' It's is NEVER the possessive.It's is wrongly used often as a possessive but in every instance it's can only mean it is or it has where has is not possessive.

That would be "Es una distribución mundial." It's the difference between using the possessive pronoun "its" and the contraction for "it is." The meaning is basically the same, but you've said it a different way, so the translation is different.